I would want to find out if it had been balanced. best would be to neutral balance it on both ends so to speak with a neutral dampener then as said you can swap commmon neutral aftermarket converters as desired or with an external dampener he can still neutral balance it for a neutral TC or if he makes it external balanced then use the 10239 B&M scalloped flexplate (for a 904) then you can still use any neutral converter


live every 24 hour block of time like it's your last day on earth